Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9886563 | Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids | 2005 | 21 Pages |
Abstract
Indirect responses are defensive strategies by which plants attract natural enemies of their herbivores that act as plant defending agents. Such defences can be either constitutively expressed or induced by the combined action of mechanical damage and low- or high-molecular-weight elicitors from the attacking herbivore. Here, we focus on two induced indirect defences, namely the de novo production of volatiles and the secretion of extrafloral nectar, which both mediate interactions with organisms from higher trophic levels (i.e., parasitoids or carnivores). We give an overview on elicitors, early signals, and signal transduction resulting in a complex regulation of indirect defences and discuss effects of cross-talks between the signalling pathways (synergistic and antagonistic effects). In the light of recent findings, we review molecular and genetic aspects of the biosynthesis of herbivore-induced plant volatiles comprising terpenoids, aromatic compounds, and metabolites of fatty acids which act as infochemicals for animals and some of which even induce defence genes in neighbouring plants. Finally, ecological aspects of these two indirect defences such as their variability, specificity, evolution as well as their ecological relevance in nature are discussed.
Keywords
P450 monooxygenasesERFALATPsOPDAACCP450MKPEFNCDPKEAGSMTOxylipinIGPHIPVExtrafloral nectarHerbivore-induced plant volatileDMNT12-Oxophytodienoic acidSIPKWIPKIndole-3-glycerol phosphatePLDSARFACFPPPLA1-MCPSAMHPLGPP1-aminocyclopropane-1-carboxylic acid1-methylcyclopropeneAlamethicinMAPKMAPK phosphataseOrcaS-adenosylmethioninejasmonic acidSalicylic acidElectroantennogramLOXFADTerpene synthaseindirect defenceCAMsystemic acquired resistancefarnesyl diphosphatephospholipase APhospholipase DlipoxygenaseMethyl jasmonateSignalling pathwayProteinase inhibitorMeJAfatty acid hydroperoxide lyasemitogen-activated protein kinaseCalcium-dependent protein kinaseGeranyl diphosphateCalmodulin
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Authors
Gen-ichiro Arimura, Christian Kost, Wilhelm Boland,